–30– has been traditionally used by journalists to indicate the end of a story. It is commonly found at the end of a press release. There are many theories about how the usage came into being,[1] e.g. from that number's use in the 92 Code of telegraphic shorthand to signify the end of a transmission in the American Civil War era.[2] In another theory, the "-30-" originated when stories were written in longhand; X marked the end of a sentence, XX the end of a paragraph, and XXX meant the end of a story. (The Roman numerals XXX equate to 30.)

In Quebec, a journalism magazine is called -trente-, the French word for thirty.